Antifriction bearing



May 31 1927.

w. PITT ANTIFR I GTE-0N BEAR ING.

' Filed May 16. 1924 2 Sheets-Sheet 1 Patented M nna. 1

UNITED" st if PA ENT oFricE-gj i1 WILLIAM'A. pm, or Mommas, oozunnq'cniann; AssroNoR T0 exc ton r; sans PM, or MONTREAL, CANA A. 5.

mmrc'rronnn'anmo.

Application flled my 16, m2! 'js narm, mares.

My invention relates to anti-friction bear- I ings. -Wt d particularly --to anti friction journalbearings' for railway. rolling stock and the like.'

object to provide an improved anti friction bearing for use between a rotary element and a relatively stationaryelemenh the bearing being so constructed and arranged that it will efl'ectively perform-Its funct on not withstanding changes in the relat ve posi-v timing of the two elements.

More specifically stated he object of the invention is to provide an anti-friction bearing which-when employed. inijourna' boxes of railwayrolling stock ,for reducing friction between the' journal and ts load,

will automatically-{adjust itselfto the'coni stantlychanging relative positioning of' tlie journaland journal box.

A further ob ect is to prov1'dea. thr ust bearing'whic'h will automatically adjust 1t self to changes in the positioning [of the journal so that'the thrust will be distributed overthe'entirebearing irrespective of the "position of the journal. I Y

Further objects are to provide a constructi0n -';Wl1i(3h may beinstalled with rapidity and ease and which may be manufactured at a comparatively low cost.

To this end the invention consists of the combination, construction and particular arrangement of the parts hereinafter described and illustrated and pointed out in the claims.

For full comprehension of my invention however, reference must be had to the ac-' companying drawings in which similar reference characters indicate the same parts, and wherein;

Figure 1 is a part elevation and sectional view of a journal bearing constructed according, to my invention; .i Figure 2 is a sectional view taken on line 2-2 Figure 1, partly-in elevation; the sectionbeing taken at right angles to that of Figure 1; i

Figures 3 and 4 are detail'views of the combined bearing member and housing for the roller bearings removed, the views being 7 taken at right angles tqeach other;

Figure 5 is a detail view of the bushing adapted to act as'an emergency bearing in the event of either of the -anti-friction bearings breaking down; and

a modifications-f a 3 Fi -7 is'; apart-elevation as sectional- Y L-" W 0f modifiedform of'thrust' bearing Broadly. stated the inventionfhas for its bearing member.

Figure 6.1 a-siinilarfviewjto Fi r d, 'or

Referring to the accompanying drawings -Thel'atter comprises-top, bottom, back and side walls 5, 6," 7, 8 and 9 respectivelyfand may be detachably secured in position clos ajfragrn'ent of a car-axle isiIIuStra'ted at 2, 5" its journal 'at 3 "and journal box at 4;" i I ing this opening in any preferred manner.

In the present embodiment the side. walls are provided with pairs of inwardly extending hooked'lugs 11' and the top and bottom'walls I with lugs 12, and the cover is adapted to be inserted between the hooked ends of the first mentioned lugs and secured upon. the a lugs 12 by bolts'14 and nuts 1'5.- 5

The back wall 7 "is provided with ti central opening 16 for the journal, a dust 8rd chamber 17, the latter having a discarge outlet at its lower end to permit cinders and the like foreign objects to dro therethrough. and an annular dust 'guar 18," the latter consisting of a packing ring oft-felt or thelike seated in a channel 19 surrounding the central opening adjacent its inner end. I a, The anti-friction bearlng comprises a unit which is mounted upon the journal in position encircling the same and which is so constructed and arranged that the oscillatory and axial motion of the journal does not Interfere in any way with the efiicient functioning of the anti-friction devices proper. The play of'the journal in serv ice is untrammeled and the anti-friction devices have an even bearing under all conditions so that a' uniform distribution of the load "is obtained.

The' unit comprises two bearings, namely a load bearing located between the journal and the top of the journal box and a thrust bearing located between the outer end of the journal and the journal box-cove'r,

In the embodiments illustrated these two bearings are combined but it is to be distinctly understood that while the combinaa collar therefor of substantially M. C. B. which is pressed a stud 72. The centre line tion of the two as a unit is preferable, parwith: These rings are spaced apart by a ticularly in the construction illustrated in semi-circular spacing collar 53 encircling Figure 7, they may be constructed indethe upper half of the spacing bush 31 and endently of each other ,without departing rigidly secured to the housing by screws 55 rom the scope of this invention. and 56. In order to facilitate the assembly The hearing which is located between the ,of these last mentioned rings within the journal and its load comprises a plurality housing the latter is provided with a semiof, preferably two, series of anti-friction circular opening 57 in the middle of its lowrollers 25 and 26 running in raceways 27 er half and outward displacement of the and 28, the latter being constituted by shalrings from the housingis prevented by inlow grooves in the peripheral faces of rings wardly extending flanges 60 and 61 at op- 29 and 30 encircling the journal. These posite ends of the housing. rings are spaced apart by a combined spac- The top 43, which is of increased thicking bush and emergency bearing 31 and the ness, is extended outwardly to within close whole is clamped upon the journal and proximity of the cover 10 and downwardly against an abutment presented by a third in juxtaposition therewith ,to a point below ring 32 encircling the inner endof the jour-' the axial line of the journal and its down- .nal' by a nut 34 screwed onto the threaded wa-rdly extending portion is of increased outer end 35 of the journal and constituting thickness as at 70 and has a socket 71 into standard. of'this plugcoincides with the axial line The outer diameter of the "combined spacof the journal and. projects inwardly toing and emergency bush is slightly less than wards the journal. and its inner end termithe outside diameter of each series of rollers nates in a head 73 having a convex hearing so that in the event of one of the series face 74. This bearing face is adapted to ens breakin down the eniergency bearing 31 gage the convex bearing face 75 presented by will assist in carrying the load until repairs a similar stud 76 pressed into a socket 77 in can be made. j the journal. The bearing thus formed is The foregoing construction and arrangeadapted to take up the end thrust of the mentof the parts provides a firm mount journal and it will be notedthat notwithfor the rollers on the journal and makes it standing changes in the position of the jourpossible to take up any play between the nal the two elements of this end thrust rings when they become loose, the tightening bearing will always be in axial alignment of the nut 34forcing the rings into tight with each other. This is particularly im contact with each other and with the abutportant when an anti friction end thrust ion ment ring 32. It is obvious that-the rollers hearing such as indicated in Figure 7 is emwill constantly follow the journal irrespecployed because the anti-friction bearing tive' of the direction of its movement and members 80 will alwaysbe in axial alignit is therefore necessary to provide means ment with. the axial projection 81 on the which in turn will follow the-rollers and journal so that-all danger of jamming of at the same time maintain an even bearing the parts is eliminated and an even distrirelationship with the journal box; The but-ion of the thrust assured! means in the present embodiment which per The bottom of the journal box is flat to forms this'function consists of what maybe provide ample accommodation for the lubricalled an equalizing bearing member 40. cant which is introduced through an 'open- This member consists ofa unitary housing of ing 85 in the cover closed by a removable substantially annular cross-section. the upplug 86.

er half of'the annulus however being of \Vhen in service the relative rocking moincreased' thickness and presenting sides 41 tion of the-journal and the journal box and 42 and a top 43 which when viewed does not disturb the intimate bearing relain front elevation are straight and conform tionship of any of the elements constituting to the'shape of the journal hoxlv either the radial load hearing or the end The top 43 presents'a convex'bearing face thrust bearing, as the convex bearing sur- 43 the area of which is approximately equal face 43* rolls or rocks against the journal to that of the bearing face 44 constituted by box and jwhile maintain ng a uniform con- 12 theunderside of the top of the journal box, tact therewith permits the outer bearing the curve of the convexity being described rings to follow the rollers. Not only does on a comparatively wide radius 50 that the this construction andarrangement o parts maximum lateral shifto-f the contacting porsecure an even distribution of the load under approximately a quarter of an inch.

tions of these two bearing faces will be all conditions but in addition. it has the- The advantage of facilitating the initial instalinside diameter oi the-housing is suff cient lation and any subsequent repair-work.

ly large to accommodate a pair of rings The entire hearing may be easily removed 50 and 51' mounted in positionsiencircling by jacking up the journal box until the the rollers and in intimate contact therejournal is relieved of its load, removing the 1 cover and Withdrawing the combined equalizerhousing and end thrust bearing carrier. This is free to be withdrawn in an axial direction. The roller bearings may then be removed by taking off the nut 34.

ing unit encircling the journal and fixed against axial movement relativelythereto but movable axially in unison therewith, a substantially cylindrical housing encircling and in bearing relation with the anti-friction bearing unit and having an external top bearing surface convex in axial section and flat in transverse section and in bearing relation with the flat bearing face of the journal box, said housing being internallyrecessed and having rings within the recess constituting outer raceways for the antifriction bearing unit, and the'housing and rings presenting an interior free from obstruct'ion to axial movement of the antifriction bearing unit and journal substantially as described. and an anti-friction thrust bearing carried-by the front end of the housing in axial alignment with; the

journal, said end thrust being constructed and ar-rangedto permit a limited axial travel of the journal and its anti-friction bearing unit relatively to the housing be-' fore taking up the end thrust.

2. In a journal box, a journ'al having a.

peripheral bearin'g surfa'ce ofunifor'm diameter and being threaded adjacent its outer end an anti-friction bearing encircling the journal, said bearing consisting of apai'r of spaced rings each having a -groove-in peripheral face constituting a raceway, and a series of, anti-friction devices adapted-torun in each groove, an emergencybearing spacing the. rings apart and consistingvof a ring of solid cross-section encircling the journal, said emergency bearin being normally inactive as a load bearing member, and means for securing the anti-friction;

bearing in position -onthefjournal, said last mentioned means consisting ofa nut screwed upon the'said threaded p'ortionof the journal and constituting'a journal collar of substantially MHC. B. standard-and an annular member encircling the anti-fric-r tion bearing having a convex top load bearingsurface for engagement with thejournal box. v

3. In a journal box, .a'journal, an antifriction fbearing encircling .the journal, means for securing the bearing in position upon the journal, equalizing bearingmean's encircling the anti-friction. bearing and consisting of an annular housing having an external" convex top constituting a broad bearing'surface, rings located within the housing and encircling the anti-friction bearing, said housing having its, ends inwardly flanged to prevent outward axial displacement of the rings, and having a transverse semi-circular opening midway its length adapted to permit the insertion of the rings -within the housing, and a semi circular member inserted within the housmg and spacing'the said rings apart, and means securing the semi-circular member in fixed position in the housing.

4. In a journal box. a journal, an antifriction bearing encircling the journal, said bearing consisting of a pair of spaced rings each having a groove in its peripheral face constituting a raceway, and a series of antifric'tion' devices adapted to run in each groove, an emergency bearing spacing the rings apart and consisting of'a ring of solid cross-section encircling the; journal, said emergency bearingbeing normally inactive as a load bearing member, meansfor scour ing the hearing in position upon the. journal, equalizing bearing" means encircling the anti-friction bearing and consisting of an annular housing having an external convex top constituting a. load bearing surface, 1

rings located within --thefhousing and encircling the anti-friction bearing, said housing having its ends inwardly flanged to prevent outward. axial displacement of the rims and having transverse semi-circular, opening niidway'i'ts length adapted to permit the insertion of, the rings within the housing, and a semi-circular member inserted within the housing and :spacing the said rings. apart,.. and means securing the semi-circular mem- 4 her in fixedposition in the housing.

5. The combination of a journal box hav ing a top portion the underside of which has a flat bearingf'a-ce; a journal extending. into the journal box, 'an anti-friction bearing unit encircling thefjournal, means for securing the anti-friction bearingupon the journal, a substantially cylindrical bearing member encircling-the anti-friction bearing: unit and having a top portion extending outwardly beyond the outer end of the journal and having, the outer end of said portion extended downwardly below the axial line of the journal, said top ortion having anexternal convexv bearing .ace in bearing relation with the said flat bearing face of the journal box, and a thrust bearing consisting of an anti-friction bearing carried.

by the outer end of the housing and an axial extension on the outer end of the journal adapted to at times bear against said bear mg.

WILLIAM A. PITT;

1 In. testlmony whereof-Thave signed my name to this specification. 

